"Individuare una forma di associazione che difensa e protegga tramite la forza comune la persona e i beni di ciascun associato e attraverso la quale ognuno, unendosi agli altri non obbedisca purtuttavia che a se stesso e rimanga libero come prima. Ecco il problema fondamentale cui il contratto sociale offre la soluzione". La lunga riflessione circa la corruzione della società, il cui progresso è secondo l'autore fonte di degrado della natura umana, sfocia nel Contratto come rimedio a quel male ingenerato dalla società medesima. Tale rimedio non consiste nel ritorno a uno stato di natura ormai perduto in cui gli uomini erano ugualmente liberi, bensì nella riforma dei principi che fondano e ispirano l'associazione etico-politica tra gli stessi. La carica innovativa de Il Contratto sociale è proprio da cercarsi in questa rottura netta rispetto al passato.
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_error() expects exactly 1 parameter, 0 given in C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php on line <i>264</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0002</td><td bgcolor='#eeeeec' align='right'>247848</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0007</td><td bgcolor='#eeeeec' align='right'>314816</td><td bgcolor='#eeeeec'>Database->connect( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>30</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0059</td><td bgcolor='#eeeeec' align='right'>316040</td><td bgcolor='#eeeeec'>Database->oops( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>83</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.0059</td><td bgcolor='#eeeeec' align='right'>316088</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-error' target='_new'>mysqli_error</a>
( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>264</td></tr>
</table></font>
<table align="center" border="1" cellspacing="0" style="background:white;color:black;width:80%;">
<tr><th colspan=2>Database Error</th></tr>
<tr><td align="right" valign="top">Message:</td><td><b>WARNING:</b> No link_id found. Likely not be connected to database.<br />Could not connect to server: <b>10.0.1.222</b>.</td></tr>
<tr><td align="right">Date:</td><td>Thursday, December 8, 2022 at 6:37:59 PM</td></tr>
<tr><td align="right">Script:</td><td><a href="/demo/obtain_abstract.php?codice=978882840117">/demo/obtain_abstract.php?codice=978882840117</a></td></tr> </table>
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_error() expects exactly 1 parameter, 0 given in C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php on line <i>264</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0002</td><td bgcolor='#eeeeec' align='right'>247848</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0007</td><td bgcolor='#eeeeec' align='right'>314816</td><td bgcolor='#eeeeec'>Database->connect( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>30</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0072</td><td bgcolor='#eeeeec' align='right'>316192</td><td bgcolor='#eeeeec'>Database->oops( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>87</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.0072</td><td bgcolor='#eeeeec' align='right'>316240</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-error' target='_new'>mysqli_error</a>
( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>264</td></tr>
</table></font>
<table align="center" border="1" cellspacing="0" style="background:white;color:black;width:80%;">
<tr><th colspan=2>Database Error</th></tr>
<tr><td align="right" valign="top">Message:</td><td><b>WARNING:</b> No link_id found. Likely not be connected to database.<br />Could not open database: <b>MacBook_V11</b>.</td></tr>
<tr><td align="right">Date:</td><td>Thursday, December 8, 2022 at 6:37:59 PM</td></tr>
<tr><td align="right">Script:</td><td><a href="/demo/obtain_abstract.php?codice=978882840117">/demo/obtain_abstract.php?codice=978882840117</a></td></tr> </table>
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_error() expects exactly 1 parameter, 0 given in C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php on line <i>264</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0002</td><td bgcolor='#eeeeec' align='right'>247848</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0083</td><td bgcolor='#eeeeec' align='right'>316736</td><td bgcolor='#eeeeec'>Database->connect( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>33</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0215</td><td bgcolor='#eeeeec' align='right'>317328</td><td bgcolor='#eeeeec'>Database->oops( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>83</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.0216</td><td bgcolor='#eeeeec' align='right'>317376</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-error' target='_new'>mysqli_error</a>
( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>264</td></tr>
</table></font>
<table align="center" border="1" cellspacing="0" style="background:white;color:black;width:80%;">
<tr><th colspan=2>Database Error</th></tr>
<tr><td align="right" valign="top">Message:</td><td><b>WARNING:</b> No link_id found. Likely not be connected to database.<br />Could not connect to server: <b>10.0.1.222</b>.</td></tr>
<tr><td align="right">Date:</td><td>Thursday, December 8, 2022 at 6:37:59 PM</td></tr>
<tr><td align="right">Script:</td><td><a href="/demo/obtain_abstract.php?codice=978882840117">/demo/obtain_abstract.php?codice=978882840117</a></td></tr> </table>
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_error() expects exactly 1 parameter, 0 given in C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php on line <i>264</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0002</td><td bgcolor='#eeeeec' align='right'>247848</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0083</td><td bgcolor='#eeeeec' align='right'>316736</td><td bgcolor='#eeeeec'>Database->connect( )</td><td title='C:\wamp64\www\demo\obtain_abstract.php' bgcolor='#eeeeec'>...\obtain_abstract.php<b>:</b>33</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0228</td><td bgcolor='#eeeeec' align='right'>317224</td><td bgcolor='#eeeeec'>Database->oops( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>87</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.0228</td><td bgcolor='#eeeeec' align='right'>317272</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-error' target='_new'>mysqli_error</a>
( )</td><td title='C:\wamp64\www\demo\used_book\classes\db\Database.singleton2.php' bgcolor='#eeeeec'>...\Database.singleton2.php<b>:</b>264</td></tr>
</table></font>
<table align="center" border="1" cellspacing="0" style="background:white;color:black;width:80%;">
<tr><th colspan=2>Database Error</th></tr>
<tr><td align="right" valign="top">Message:</td><td><b>WARNING:</b> No link_id found. Likely not be connected to database.<br />Could not open database: <b>orders_db</b>.</td></tr>
<tr><td align="right">Date:</td><td>Thursday, December 8, 2022 at 6:37:59 PM</td></tr>
<tr><td align="right">Script:</td><td><a href="/demo/obtain_abstract.php?codice=978882840117">/demo/obtain_abstract.php?codice=978882840117</a></td></tr> </table>